Insect repellent



porated in oils, creams, emulsions,

Patented June 26, 1934 INSECT REPELLENT Clarence R. Clevelan Chicago,Ill., assignor to Standard Oil Company, Chicago, 111., a corporationofIndiana No Drawing. Application January 5, 1932, Serial No. 584,897

9Claims.

10 -o-o.m.a

Br-O

wherein n represents an integer; R represents an aryl radical, hydroarylradical, or substituent thereof; and R1 represents an alkyl radical.

The salicylates may be incorporated in any suitable vehicle; forexample, they may be incoror other suitable vehicles. The followingexample will serve to illustrate a suitable preparation.

Example 1 Theabove ingredients are thoroughly emulsified to form acosmetic cream in the manner well known to the art, and the cream may bespread upon the area infested with the insects.

The salicylates may be dissolved in an oil, such as mineral oilsorvegetable oils, and sprayed upon the infested area.

Example 2 Mineral oil having a viscosity of 80 to 85 Saybolt viscosityat 100 F 96% Phenethyl salicylate 4% Mineral oils or refined mineraloils having a viscosity from 70 to 90 Saybolt at 100 F. may be used inthe above example as suitable vehicles for the salicylates. Suitablenon-irritant vegetable and animal oils may also be used as a vehicle forthe insectifuges, for example, whale oil,

cottonseed oil and the like. Also, mixtures of the salicylates may bedissolved in a suitable vehicle and used, or other insectifuges, such aspyrethrum, may be used in combination with the 5 salicylates.

Example 3 Mineral oil to 90 Saybolt viscosity at 100 F., containing theactive principles from to 2 1b. of pyrethrum flowers per gallon Benzylsalicylate The following compounds are representative of those compoundswhich may be employed in the above examples: benzyl salicylate,phenethyl 5 salicylate, phenylpropyl salicylate, cinnamyl Salicylate,hydrocinnamyl salicylate, methylbenzyl salicylate, hydrobenzylsalicylate, methyl ether of benzyl salicylate, ethyl ether of phenethylsalicylate, ethyl ether of benzyl salicylate, butyl "l0 ether of benzylsalicylate, and other ethers boiling within the range of the abovecompounds may be used.

The proportions of the esters used in the above examples may be variedaccording to the activity of the particular ester used and the insect tobe repelled. The salicylates may be effectively used in concentrationsas high as 10% but generally concentrations from 1 to 5% aresatisfactory.

This application is a continuation-in-part of my co-pending applicationNo. 377,333, filed July I 10, 1929 (Patent 1,911,551 May 30, 1933).

Although I have given specific examples to illustrate my invention, itshould be understood that these are not intended as limitations upon thescope of theinvention.

I claim:

1. An insect repellent comprising an aralkyl ester of salicylic acid.

2. An insect repellent comprising cylate.

3. An insect repellent comprising an alkyl ether of an aralkylsalicylate.

4. An insect repellent comprising salicylate. I

5. An insect repellent-comprising a mineral oil solution of an aralkylsalicylate.

6. An insect repellent comprising a mineral oil solution of benzylsalicylate.

'7. An insect repellent comprising a .mineral oil solution containingthe active principles from pyrethrum flowers, and an aralkyl salicylate.

8. An insect repellent comprising a compound of the general formulabenzyl saliphenethyl wherein n represents an integer and R representswherein n represents an integer, R represents an aryl radical.

an aryl radical, hydroaryl radical, or a substitu- 9. An insectrepellent comprising a compound ent thereof, and R1 represents an alkylradical.

of the general formula Rr-O CLARENCE R. CLEVELAND.

